diff --git a/include/build_config/SDL_build_config.h.cmake b/include/build_config/SDL_build_config.h.cmake
index b60b545210..9503b3882a 100644
--- a/include/build_config/SDL_build_config.h.cmake
+++ b/include/build_config/SDL_build_config.h.cmake
@@ -52,7 +52,6 @@
 #if HAVE_LIBC
 
 /* Useful headers */
-#cmakedefine STDC_HEADERS 1
 #cmakedefine HAVE_ALLOCA_H 1
 #cmakedefine HAVE_CTYPE_H 1
 #cmakedefine HAVE_FLOAT_H 1
diff --git a/src/SDL_internal.h b/src/SDL_internal.h
index fa4dd7c83c..6f97045f1b 100644
--- a/src/SDL_internal.h
+++ b/src/SDL_internal.h
@@ -74,7 +74,7 @@
 # include <stdarg.h>
 #endif
 #ifdef HAVE_STRING_H
-# if !defined(STDC_HEADERS) && defined(HAVE_MEMORY_H)
+# ifdef HAVE_MEMORY_H
 #  include <memory.h>
 # endif
 # include <string.h>